/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/Operations/IntrinsicCorrespondenceUtils.h
number of surface edges that cross corner the specified corner of the intrinsic triangle defined by the given edges. note, it is assumed that IntrinsicTriEIDs are edge ID of an intrinsic triangle, but no checking is done.
int32 NumCornerCrossingRefEdges ( const [FIndex3i](API\Runtime\GeometryCore\FIndex3i) & IntrinsicTriEIDs, const int32 TriCornerIndex ) const